quota: quota core changes for quotaon on remount

Currently, we just turn quotas off on remount of filesystem to read-only
state.  The patch below adds necessary framework so that we can turn quotas
off on remount RO but we are able to automatically reenable them again when
filesystem is remounted to RW state.  All we need to do is to keep references
to inodes of quota files when remounting RO and using these references to
reenable quotas when remounting RW.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 12 insertions, 2 deletions

diff --git a/include/linux/quota.h b/include/linux/quota.h
index 48556b039b1c..52e49dce6584 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -202,6 +202,8 @@ struct quota_format_type;
 
 struct mem_dqinfo {
         struct quota_format_type *dqi_format;
+        int dqi_fmt_id;         /* Id of the dqi_format - used when turning
+                                 * quotas on after remount RW */
         struct list_head dqi_dirty_list;        /* List of dirty dquots */
         unsigned long dqi_flags;
         unsigned int dqi_bgrace;
@@ -298,8 +300,8 @@ struct dquot_operations {
 
 /* Operations handling requests from userspace */
 struct quotactl_ops {
-        int (*quota_on)(struct super_block *, int, int, char *);
-        int (*quota_off)(struct super_block *, int);
+        int (*quota_on)(struct super_block *, int, int, char *, int);
+        int (*quota_off)(struct super_block *, int, int);
         int (*quota_sync)(struct super_block *, int);
         int (*get_info)(struct super_block *, int, struct if_dqinfo *);
         int (*set_info)(struct super_block *, int, struct if_dqinfo *);
@@ -320,6 +322,10 @@ struct quota_format_type {
 
 #define DQUOT_USR_ENABLED       0x01            /* User diskquotas enabled */
 #define DQUOT_GRP_ENABLED       0x02            /* Group diskquotas enabled */
+#define DQUOT_USR_SUSPENDED     0x04            /* User diskquotas are off, but
+                                                 * we have necessary info in
+                                                 * memory to turn them on */
+#define DQUOT_GRP_SUSPENDED     0x08            /* The same for group quotas */
 
 struct quota_info {
         unsigned int flags;                     /* Flags for diskquotas on this device */
@@ -337,6 +343,10 @@ struct quota_info {
 #define sb_any_quota_enabled(sb) (sb_has_quota_enabled(sb, USRQUOTA) | \
                                   sb_has_quota_enabled(sb, GRPQUOTA))
 
+#define sb_has_quota_suspended(sb, type) \
+        ((type) == USRQUOTA ? (sb_dqopt(sb)->flags & DQUOT_USR_SUSPENDED) : \
+                              (sb_dqopt(sb)->flags & DQUOT_GRP_SUSPENDED))
+
 int register_quota_format(struct quota_format_type *fmt);
 void unregister_quota_format(struct quota_format_type *fmt);